Distribution of Precipitation Depending on Synoptic Scale Disturbances with Satellite Estimate Comparisons in the Japanese Alps Area during Warm Seasons

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  • 暖候期の中部山岳における総観規模擾乱に応じた降水分布と衛星降水量の比較
  • ダンコウキ ノ チュウブ サンガク ニ オケル ソウ カン キボ ジョウラン ニ オウジタ コウミズブンプ ト エイセイ コウスイリョウ ノ ヒカク

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Abstract

<p> Gauge-based hourly precipitation data during the 2015-2016 warm seasons in central Japan observed with the Japan Meteorological Agency AMeDAS network and the Japanese Alps Inter-University Cooperation Project (JALPS) mountain observation network are archived. Gauge data are compared to satellite precipitation data (GSMaP_MVK and GPM/DPR) produced by Japan Aerospace Exploration Agency. The distributions of precipitation measured in gauges depend on synoptic scale disturbances showing areas of regional increases/decreases affected by large mountain ranges without year-to-year variability, except for a composite of typhoon cases. Differences in precipitation amounts are less than 2 mm/d depending on satellite product version or timing of passive microwave observations. Larger precipitation amounts of GSMaP_MVK estimated at more than 2 mm/d are distributed over inner mountain areas and northern coastal areas along the Sea of Japan, and larger amounts of gauge-measured precipitation are distributed in central Gifu and Shizuoka Prefectures. The underestimate of local sporadic heavy precipitation in mountainous areas obtained from GSMaP_MVK data was expected depending on shallow convections. Further strategies are discussed for conducting case studies to reveal the causes of discrepancies between gauge-measured and satellite-indicated precipitation.</p>

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